JPS6315895B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides lining for the purpose of repairing or reinforcing pipes buried underground, such as gas pipes, water pipes, power lines, communication lines, etc. It relates to a method for administering. Conventionally, the method of lining this type of pipe is to use fluid pressure to insert a flexible cylindrical lining material into the pipe while turning it inside out so that the inside is facing out, and at the same time bonding it to the inner surface of the pipe. Are known.

An example of this method will be explained according to Fig. 1.
Reference numeral 1 denotes a lining material, and an adhesive is applied to the inner surface of the lining material 1, and a flexible string-like elongated object 2 is inserted into the lining material 1.

3 is a pressure vessel, which has an opening 4 in its front part.
Further, a pressure fluid inlet 5 is attached to the upper part. The lining material 1 is wound into a coil shape and housed in the pressure vessel 3. One end of the lining material 1 is unwound from the coil and fixed in an annular manner between the opening 4 and one end of the conduit 6, and the string-like elongated object 2 is inserted into the conduit 6. In this state, when pressure fluid is fed into the pressure vessel 3 to pressurize it, the fluid pressure acts on the rear part of the annular fixed part of the lining material 1, and this part is pushed forward slightly to form the folded part 1a. be done. Here, when the string-like long object 2 is pulled from the other end side of the pipe line 6, the lining material 1
is turned over at the folded portion 1a so that the inside becomes the outside, and is brought into pressure contact with the inner surface of the conduit 6 via an adhesive by fluid pressure. By proceeding with this turning over, the folded portion 1a is advanced from one end of the pipe 6 to the other end, and after the lining material 1 is pressed against the inner surface over the entire length of the pipe 6, the adhesive is applied. After hardening, the lining material 1 is adhered to the inner surface of the conduit 6 to form a lining.

This method requires only excavating the ground at both ends of the pipeline to be lined, and is a method that can be worked efficiently in a short time, and has been attracting particular attention in recent years.
However, even with this method, many problems arise in actual construction. For example, if the reversal speed of the lining material 1 becomes faster than the pulling speed of the string-like long object 2 for some reason, the string-like long object 2 will sag due to its flexibility, and as shown in FIG. Sometimes a long string-like object that is loose may be placed in the floor. In this state, the string-like long object 2 cannot be pulled forward,
Further, it becomes impossible to continue turning the inside out using fluid pressure, and the lining material 1 must be pulled back once. Conversely, if the pulling speed of the string-like elongated object 2 is too high, the portion 1c of the lining material 1 that has not yet been turned over will be pulled by the string-like elongate object 2 and locally move forward excessively, causing The camera will be pressed in, making it impossible to flip it smoothly. In order to avoid such a situation, it is necessary to strictly control the take-up speed of the string-like long object 2 and the delivery speed of the lining material 1, which is extremely difficult. In addition, in the lining material portion 1b which has already been turned over and is pressed against the inner surface of the pipe line 6, there is a lining material portion 1c which has not yet been turned over, and a lining material extending behind the lining material 1 in order to adjust the feeding speed of the lining material 1. However, if there is a bend in the conduit 6, the string-like object 7, etc. will pass through the shortest distance due to tension, as shown in FIG. The part along the inside of the part is locally strongly rubbed by the string-like elongated object 2, etc., and is extremely easily damaged.

In addition, the string-like object 7 pulled out in front of the folded portion 1a of the lining material 1 also passes through the shortest distance along the inside of the bend at the bend of the conduit 6, as shown in FIG. . Therefore, lining material 1
When the folded portion 1a passes through this bend, it is guided by the string-like material 7 and passes while being drawn to the inside of the bend. Therefore, the lining material 1 cannot follow the outside of the bend, and the lining material 1 may peel off from the pipe line 6 or create a space, which may narrow the flow path of the pipe line.

The present invention has been made in view of such circumstances, and in place of the string-like long object 2 in the above method,
A flexible elongated body 7 having a certain degree of rigidity that is difficult to bend with a radius of curvature smaller than the radius of the lining material 1 is inserted into the lining material 1, and when the inside-out progresses, it is possible to By pushing the flexible elongated body 7 from behind, the lining material 1 is advanced and turned inside out.

According to the present invention, the pressure of the fluid and the flexible elongate body 7
The lining material 1 is advanced within the conduit 6 by the pushing force, is turned over at the folded portion 1a, and is brought into pressure contact with the inner surface of the conduit 6 via the adhesive by fluid pressure. Furthermore, since the flexible elongated object pushed forward from the folded portion 1a has a certain degree of rigidity as described above, it does not loosen or stagnate within the conduit 6, and the force pushing it from behind can be applied. As a result, it moves forward in the pipe 6 and does not fall into the folded portion 1a as shown in FIG. Furthermore, in the case where the flexible elongated object 7 passes through the inside of the lining material portion 1b that has already been turned over, at the bent portion of the conduit 6,
As shown in FIG. 4, the flexible elongated object 7 is pushed from behind and moves in a meandering manner along the outside of the bend. Therefore, the lining material portion 1b, which has already been turned inside out, will not be locally rubbed by the flexible elongated object 7 and damaged.

Furthermore, if the flexible elongated object 7 pushed forward from the folded portion 1a has a bend in the pipe 6 in front of it, the flexible elongated object 7 will also follow the outside of the bend in the pipe as shown in FIG. Proceed to. Therefore, lining material 1
is guided by the flexible elongated object 7, and at the bend, the inside-out progresses along the outside of the bend, so that the lining material 1 may peel off from the pipe 6 on the outside of the bend, or the pipe may It does not narrow the flow path.

The flexible elongated material used in the present invention is suitably wire, piano wire, synthetic resin brittle, or synthetic fiber yarn whose outer surface is coated with polyethylene resin or the like.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a state in which a pipe line is lined. FIG. 2 is a longitudinal cross-sectional view showing a state in which a string-like elongated object is laid in the folded portion in a conventional method. FIG. 3 is a longitudinal cross-sectional view showing a situation in which a string-like elongated object passes through a portion of the lining material that has already been turned inside out at a bent portion of a conduit in a conventional method. FIG. 4 is a longitudinal cross-sectional view showing a situation in which a flexible elongated object passes through a portion of the lining material that has already been turned inside out at the bent portion of the conduit in the method of the present invention. 1... Lining material, 1a... Folded part, 6...
...Pipeline, 7...Flexible long object.

Claims (1)

[Claims] 1. Apply adhesive to the inner surface of a flexible cylindrical lining material, and place a flexible elongated body inside the lining material that has a certain degree of rigidity that is difficult to bend with a radius of curvature smaller than the radius of the lining material. one end of the lining material is fixed in an annular shape at one end of the pipe, and the lining material is advanced by pushing the flexible elongated body from behind while applying fluid pressure to the rear part of the annular fixed part. Then, at the folded part of the lining material formed on the annular fixed part, the lining material is turned over so that the inside becomes the outside, and the turned over lining material is pressed onto the inner surface of the pipe via the adhesive by the fluid pressure, and the lining material is A conduit characterized in that the folded portion progresses from one end of the conduit to the other end by sequentially turning over the lining material, and then the adhesive is cured to adhere the reversed lining material to the inner surface of the conduit. lining method.